CN114635973A - Main steam high-temperature high-pressure valve seat-replaceable stop valve - Google Patents

Abstract

The invention discloses a main steam high-temperature high-pressure replaceable valve seat stop valve which comprises a valve body, a valve rod, a valve cover, a valve clack and a valve seat, wherein a first flow passage and a second flow passage which extend inwards are respectively arranged at two ends of the valve body; still include disk seat locking mechanism, disk seat locking mechanism includes that the adjustable valve barrel of antiscour and pushes down the subassembly, first runner is equipped with the support flange with the juncture in excess flow chamber, the annular mounting groove has been seted up to the one side that is close to the excess flow chamber on the support flange, the disk seat inlays to be established in the annular mounting groove, and the bottom of disk seat is equipped with sealed the pad, it is used for pressing the adjustable valve barrel of antiscour to push down the subassembly setting on the inner wall in excess flow chamber on the disk seat, make the disk seat compressed tightly on the annular mounting groove, the inner wall of the adjustable valve barrel of antiscour closely laminates with the outer wall of valve clack, the overflow mouth has still been seted up to the lateral part of the adjustable valve barrel of antiscour. The valve seat has the advantage of replaceable valve seat, and the time for overhauling the valve can be greatly shortened.

Description

Main steam high-temperature high-pressure valve seat-replaceable stop valve

Technical Field

The invention relates to the technical field of valve structures, in particular to a stop valve with a replaceable valve seat for main steam at high temperature and high pressure.

Background

The high-temperature high-pressure thermal power plant is the main energy supply department in China and the life line of national economy, and the accidents of the power plant not only affect the production of the power plant, but also directly cause the whole national economy to suffer huge losses. The stop valve that adorns in large-scale high temperature high pressure thermal power factory counts thousands, because the working medium of high temperature high pressure thermal power factory is high temperature high pressure steam and water, the working medium velocity of flow is big, when flowing through the disk seat and the valve clack of stop valve, makes its wearing and tearing extremely fast, and some stop valves can not just be changed in 6 months, and to inferior valve, the valve accident rate is higher, and the change of valve directly influences the production and the safe operation of power factory. Its disk seat of high temperature high pressure welding stop valve commonly used in market is difficult to dismantle, changes the required time of a high temperature high pressure welding stop valve, also must 10 hours the fastest, promptly: the valve was cut from the pipe for 2 hours, the new valve was welded for 3 hours, and the weld was heat treated for 5 hours. If the power failure of the valve is 10 hours due to the accident, the loss of other national economic industries is huge.

Therefore, there is a need for a high temperature and high pressure replaceable seat shut-off valve to solve the above problems.

Disclosure of Invention

The invention aims to provide a main steam high-temperature high-pressure replaceable valve seat stop valve which has the advantage of replaceable valve seats and can greatly shorten the time for repairing the valve.

In order to achieve the purpose, the invention provides the following technical scheme: the main steam high-temperature high-pressure removable valve seat stop valve comprises a valve body, a valve rod, a valve cover, a valve clack and a valve seat, wherein a first flow passage and a second flow passage which extend inwards are respectively arranged at two ends of the valve body; still include disk seat locking mechanism, disk seat locking mechanism includes anti-scouring adjustable valve barrel and pushes down the subassembly, the juncture in first runner and overflowing chamber is equipped with the support flange, the annular mounting groove has been seted up to one side that is close to the overflowing chamber on the support flange, the disk seat inlays to be established in the annular mounting groove, and the bottom of disk seat is equipped with and is used for constituting sealed complex sealed the pad with the annular mounting groove, it is used for pressing anti-scouring adjustable valve barrel on the disk seat to push down the subassembly setting on the inner wall in overflowing chamber for the disk seat is compressed tightly on the annular mounting groove, anti-scouring adjustable valve barrel and the coaxial setting of valve clack and the inner wall of anti-scouring adjustable valve barrel closely laminate with the outer wall of valve clack, the overflow mouth has still been seted up to anti-scouring adjustable valve barrel's lateral part.

Through adopting above-mentioned technical scheme, disk seat and valve body are split type structure, and the disk seat passes through disk seat locking mechanism and installs in the valve body, and during the installation, utilize the push down subassembly to resist and erode adjustable valve barrel and apply a decurrent effort for the disk seat is compressed tightly by the anti adjustable valve barrel of erodeing and accomplishes the installation of disk seat on the annular mounting groove of support flange, when needing to dismantle the disk seat, only need demolish in proper order push down the subassembly and resist after the adjustable valve barrel of erodeing, again with the disk seat take out can, the operation is very convenient. Therefore, the valve seat has the advantage of replaceable valve seats, the time for repairing the valve can be greatly shortened, and the economic loss of local enterprises caused by power failure is greatly reduced.

The invention is further provided that the upper end of the valve seat is provided with a positioning flange, the positioning flange extends into the anti-scouring adjustable valve sleeve, and the outer wall of the positioning flange is tightly attached to the inner wall of the anti-scouring adjustable valve sleeve.

Through adopting above-mentioned technical scheme, the effect that the location flange can the adjustable valve barrel of antiscour play the location not only is convenient for install the operation, can promote the stability of the adjustable valve barrel installation of antiscour moreover, avoids the in-process of its use to produce and slides.

The invention is further set that the pressing component comprises a pre-tightening pressing ring and pre-tightening screws, the inner wall of the overflowing cavity is provided with a thread part, the pre-tightening pressing ring is in threaded connection with the thread part, the pre-tightening pressing ring is circumferentially provided with a plurality of screw holes, a circular groove is arranged at the position, located at the upper end of each screw hole, of the pre-tightening pressing ring, the pre-tightening screws are in threaded fit with the corresponding screw holes, the screw rod parts of the pre-tightening screws abut against the upper end face of the anti-washing adjustable valve sleeve, and the screw head parts of the pre-tightening screws are embedded into the corresponding circular grooves.

Through adopting above-mentioned technical scheme, through adjusting pretension screw, can will realize the locking or the unblock of disk seat, simple structure, it is very convenient to operate.

The anti-scouring adjustable valve sleeve is characterized in that the upper end of the anti-scouring adjustable valve sleeve is circumferentially provided with a spiral pipe part, the periphery of the spiral pipe part is in threaded connection with a supporting gasket, and an elastic gasket is clamped between the supporting gasket and the anti-scouring adjustable valve sleeve.

Through adopting above-mentioned technical scheme, because the adjustable valve barrel upper end of antiscour receives extrusion and the friction of pretension screw lower extreme for a long time, consequently its surface receives the wearing and tearing of different degrees easily, when a plurality of pretension screws supported on the adjustable valve barrel of antiscour, the easy atress inequality of adjustable valve barrel of antiscour leads to the result stability variation, this structure has realized the removable effect of contact surface on the adjustable valve barrel of antiscour, guarantee that the adjustable valve barrel of antiscour upper surface is smooth complete, and then promote the stability of the adjustable valve barrel of antiscour and valve seat mounting structure.

The invention is further provided that the valve seat locking mechanism further comprises an alignment assembly, the alignment assembly comprises a mounting ring, an alignment ring, a limiting ring and a support spring, the mounting ring is sleeved on the periphery of the valve rod and is mounted on the valve rod through a locking screw, the alignment ring is connected to the periphery of the mounting ring in a threaded manner, the bottom of the mounting ring is provided with a limiting flange for limiting the alignment ring, the periphery of the alignment ring is provided with an alignment flange, a reinforcing rib is arranged between the upper end surface of the alignment flange and the periphery of the alignment ring, the upper end of the alignment ring is provided with a plurality of rotating plates along the circumferential direction, the quantity of the limiting ring and the quantity of the support spring are equal to that of the pre-tightening screws, the limiting ring and the support spring are sleeved on the periphery of the screw part of the corresponding pre-tightening screws, the lower end of the support spring abuts against the inner end surface of the circular groove, the upper end of the support spring abuts against the lower end surface of the limiting ring for pressing the limiting ring against the bottom end part of the head part of the pre-tightening screws, the periphery of the limiting ring is tightly attached to the inner periphery of the circular groove, a guide hole communicated with the circular groove is formed in the inner wall of the pre-tightening pressing ring, a limiting convex part is arranged on the side part of the limiting ring, extends out of the guide hole and abuts against the upper end of the alignment flange.

Through adopting above-mentioned technical scheme, it is the same that the screw-in degree of depth that a plurality of pretension screws can be guaranteed to the subassembly that aligns to guarantee that the atress of the adjustable valve barrel of antiscour is even, further promoted the stability of the adjustable valve barrel of antiscour and disk seat mounting structure.

The invention is further arranged in such a way that a first spring groove coaxial with the circular groove is arranged on the inner end surface of the circular groove, a second spring groove is arranged at the bottom end of the limiting ring, the upper end of the supporting spring is embedded in the first spring groove, and the lower end of the supporting spring is embedded in the second spring groove.

Through adopting above-mentioned technical scheme, can promote the stability of supporting spring installation and motion process.

The invention is further provided that the position of the inner circumference of the valve seat near the lower end is provided with a thread groove along the circumferential direction, the thread groove is internally and threadedly connected with an installation ring, the inner diameter of the installation ring is the same as that of the valve seat, two groups of disassembly auxiliary components are symmetrically arranged on the installation ring, the disassembly auxiliary assembly comprises a rotating shaft and a pull rod, a pair of hidden grooves for the pull rod to be embedded are symmetrically formed in the inner wall of the mounting ring, friction plates which are in damping fit with the pull rod are arranged at the bottoms of the hidden grooves, the mounting ring is provided with a through hole communicated with the hidden groove, the rotating shaft is inserted in the through hole, the pull rod is provided with a round hole for the rotating shaft to pass through, the side part of the pull rod is provided with a flow guide part with a trapezoidal section, the inclined plane of the flow guide part is arranged towards the direction of the first flow channel, and when the pull rod is embedded in the hidden groove, the flow guide part protrudes out of the hidden groove.

Through adopting above-mentioned technical scheme, because the smooth strong point that can exert moment of disk seat circumference does not have, it inlays to establish and is difficult taking out in annular mounting groove, thereby sets up the pull rod and can be convenient for exert moment and pull out the disk seat to during normal use, the pull rod embedding hides the groove, and the water conservancy diversion portion protrusion can improve the turbulent state when fluid passes through the disk seat in hiding the groove.

The invention is further arranged in such a way that the upper end surface of the valve clack is provided with a threaded hole and a connecting groove which are communicated with each other from top to bottom, the inner end of the valve rod is provided with a connecting convex part, the threaded hole is in threaded connection with a valve clack cover, and the inner end of the valve clack cover is abutted against the inner end of the connecting convex part so that the connecting convex part is pressed in the connecting groove.

Through adopting above-mentioned technical scheme, can realize that the linkage of valve rod and valve clack is connected, connection structure is simple, stable and firm.

The invention is further provided with a self-sealing assembly and a valve rod sealing assembly, wherein the self-sealing assembly comprises a sealing ring, a backing ring, four open rings, a first pressure plate and a pre-tightening plate, the inner wall of the valve neck of the valve body is provided with an annular groove along the circumferential direction, the parts of the four open rings close to the periphery are embedded on the annular groove, the valve cover is inserted into the valve neck of the valve body, a sealing cavity with a trapezoidal section is formed between the valve cover and the valve body, the sealing ring and the backing ring are arranged in the sealing cavity from bottom to top, the section shape of the sealing ring corresponds to that of the sealing cavity, the first pressure plate and the pre-tightening plate are arranged above the four open rings, the pre-tightening plate is connected with the periphery of the valve cover in a threaded manner, a plurality of socket head cap screws are connected on the pre-tightening plate in a threaded manner along the circumferential direction, the inner hexagon screw penetrates through the pre-tightening plate to press the first pressing plate on the upper end face of the four open rings; the valve rod sealing assembly comprises a packing pressing plate, a packing pressing sleeve and a sealing packing, a sealing groove coaxial with the valve rod is formed in the valve cover, the sealing packing is embedded in the sealing groove, the packing pressing plate and the packing pressing sleeve are sleeved on the periphery of the valve rod from top to bottom, the packing pressing plate is connected with the pre-tightening plate through a bolt, and the packing pressing sleeve is pressed on the upper end of the sealing packing.

Through adopting above-mentioned technical scheme, can guarantee the leakproofness between valve gap and the valve body and between valve gap and the valve rod, avoid the inside medium of valve body to leak outside and arouse the incident from the clearance between valve gap and the valve body and between valve gap and the valve rod.

The invention is further set up in that a threaded section is arranged on the valve rod, a valve rod nut is in threaded connection with the threaded section, a hand wheel is in linkage connection with the valve rod nut, a support is mounted at the upper end of a valve neck of the valve body through a bolt, a box body sleeved on the periphery of the valve rod nut is arranged at the upper end of the support, an annular bulge is circumferentially arranged at the position of the valve rod nut in the box body, a bearing is respectively arranged at the upper end and the lower end of the annular bulge in the box body, and a pressing ring for pressing the annular bulge and the two bearings in the box body is further in threaded connection with the upper part of the inner side of the box body.

Through adopting above-mentioned technical scheme, can realize the lift of valve through rotatory hand wheel, and then drive the valve clack and keep away from or be close to the disk seat motion, simple structure not only, the equipment production of being convenient for, operating torque is little moreover, makes the workman light more when carrying out the operation of opening and close of valve.

Drawings

FIG. 1 is a schematic view of the structure of the present invention;

FIG. 2 is a detailed structural schematic diagram of the present invention;

FIG. 3 is a schematic view of the mounting structure of the valve seat of the present invention;

FIG. 4 is an enlarged view of portion A of FIG. 3;

FIG. 5 is a schematic view of the construction of the mounting collar of the present invention;

FIG. 6 is a schematic view of the self-sealing assembly and valve stem seal assembly of the present invention.

In the figure: 1. a valve body; 2. a valve stem; 3. a valve cover; 4. a valve flap; 5. a valve seat; 6. a first flow passage; 7. a second flow passage; 8. a flow-through chamber; 9. a valve seat locking mechanism; 10. an anti-scour adjustable valve sleeve; 11. a support flange; 12. an annular mounting groove; 13. a gasket; 14. a flow-through port; 15. a positioning flange; 16. pre-tightening the pressing ring; 17. pre-tightening the screw; 18. a threaded portion; 19. a screw hole; 20. a circular groove; 21. a solenoid portion; 22. a support washer; 23. an elastic washer; 24. an alignment assembly; 25. a mounting ring; 26. an alignment ring; 27. a limiting ring; 28. a support spring; 29. a locking screw; 30. a limiting flange; 31. an alignment flange; 32. reinforcing ribs; 33. a rotating plate; 34. a guide hole; 35. a limiting convex part; 36. a first spring groove; 37. a second spring groove; 38. a thread groove; 39. installing a ring; 40. disassembling the auxiliary assembly; 41. a rotating shaft; 42. a pull rod; 43. hiding the groove; 44. a friction plate; 45. a through hole; 46. a circular hole; 47. a flow guide part; 48. a threaded hole; 49. connecting grooves; 50. a connecting projection; 51. a valve flap cover; 52. a self-sealing assembly; 53. a seal ring; 54. a backing ring; 55. opening a ring; 56. a first platen; 57. pre-tightening the plate; 58. an annular groove; 59. sealing the cavity; 60. a socket head cap screw; 61. a packing press plate; 62. pressing and sleeving the filler; 63. sealing and filling; 64. a sealing groove; 65. a threaded segment; 66. a valve stem nut; 67. a hand wheel; 68. a support; 69. a box body; 70. an annular projection; 71. a bearing; 72. pressing a ring; 73. pressing the assembly; 74. a valve stem seal assembly.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The embodiment is as follows: the main steam high-temperature high-pressure replaceable valve seat stop valve shown in the attached drawings 1-6 comprises a valve body 1, a valve rod 2, a valve cover 3, a valve flap 4 and a valve seat 5, wherein a first flow passage 6 and a second flow passage 7 which extend inwards are respectively arranged at two ends of the valve body 1, a flow passing cavity 8 which is used for communicating the first flow passage 6 with the second flow passage 7 is arranged inside the valve body 1, the valve cover 3 is arranged at the upper end of the valve body 1, the valve rod 2 penetrates through the valve cover 3 and extends into the flow passing cavity 8, the valve flap 4 is arranged at the inner end of the valve rod 2, and the valve seat 5 is arranged between the first flow passage 6 and the flow passing cavity 8 and is used for forming sealing fit with the valve flap 4; this stop valve still includes disk seat locking mechanism 9, disk seat locking mechanism 9 includes that adjustable valve barrel of antiscour 10 and pushes down subassembly 73, first runner 6 is equipped with support flange 11 with the juncture that overflows the chamber 8, support flange 11 and 1 formula structures as an organic whole of valve body, annular mounting groove 12 has been seted up to one side that is close to overflow chamber 8 on the support flange 11, disk seat 5 inlays to be established in annular mounting groove 12, and the bottom of disk seat 5 is equipped with and is used for constituting sealed complex sealed pad 13 with annular mounting groove 12, and this sealed pad 13 is made by the metal material, it is used for pressing adjustable valve barrel of antiscour 10 on disk seat 5 to push down subassembly 73 setting on overflowing the inner wall of chamber 8 for disk seat 5 is compressed tightly on annular mounting groove 12 to adjustable valve barrel of antiscour 10 also has the guide effect to valve clack 4, adjustable valve barrel of antiscour 10 and the coaxial setting of valve clack 4 and the inner wall of adjustable valve barrel of antiscour 10 and the outer of valve barrel 4 The walls are tightly attached, and the lateral part of the anti-scouring adjustable valve sleeve 10 is also provided with a flow port 14. The valve seat 5 and the valve body 1 are of a split structure, the valve seat 5 is installed in the valve body 1 through the valve seat locking mechanism 9, during installation, a downward acting force is applied to the anti-scouring adjustable valve sleeve 10 through the pressing component 73, the valve seat 5 is tightly pressed on the annular installation groove 12 of the supporting flange 11 through the anti-scouring adjustable valve sleeve 10, installation of the valve seat 5 is completed, when the valve seat 5 needs to be disassembled, only the pressing component 73 and the anti-scouring adjustable valve sleeve 10 need to be disassembled in sequence, and then the valve seat 5 is taken out, so that the operation is very convenient. Therefore, the valve seat has the advantage that the valve seat 5 is replaceable, the time for repairing the valve can be greatly shortened, and the economic loss of local enterprises caused by power failure is greatly reduced.

As shown in fig. 1, the upper end of the valve seat 5 is provided with a positioning flange 15, the positioning flange 15 extends into the anti-scouring adjustable valve sleeve 10, and the outer wall of the positioning flange 15 is tightly attached to the inner wall of the anti-scouring adjustable valve sleeve 10. The positioning flange 15 can play a positioning role in the anti-scouring adjustable valve sleeve 10, so that the installation operation is facilitated, the installation stability of the anti-scouring adjustable valve sleeve 10 can be improved, and the sliding in the using process is avoided.

As shown in fig. 3, the pressing component 73 includes a pre-tightening pressing ring 16 and a pre-tightening screw 17, a screw thread portion 18 is disposed on an inner wall of the flow passage chamber 8, the pre-tightening pressing ring 16 is connected to the screw thread portion 18 in a threaded manner, a plurality of screw holes 19 are circumferentially disposed on the pre-tightening pressing ring 16, a circular groove 20 is disposed at a position on the pre-tightening pressing ring 16, which is located at an upper end of each screw hole 19, the pre-tightening screw 17 is in threaded engagement with the corresponding screw hole 19, a screw portion of the pre-tightening screw 17 abuts against an upper end surface of the anti-washing adjustable valve sleeve 10, and a screw head portion of the pre-tightening screw 17 is embedded into the corresponding circular groove 20. The valve seat 5 can be locked or unlocked by adjusting the pre-tightening screw 17, and the valve seat locking device is simple in structure and very convenient to operate.

As shown in fig. 3, a screw portion 21 is circumferentially disposed at an upper end of the anti-flushing adjustable valve sleeve 10, a support washer 22 is threadedly connected to an outer periphery of the screw portion 21, and an elastic washer 23 is interposed between the support washer 22 and the anti-flushing adjustable valve sleeve 10. Because the upper end of the antiscour adjustable valve sleeve 10 is extruded and rubbed by the lower end of the pre-tightening screw 17 for a long time, the surface of the antiscour adjustable valve sleeve 10 is easily worn to different degrees, when a plurality of pre-tightening screws 17 are propped against the antiscour adjustable valve sleeve 10, the antiscour adjustable valve sleeve 10 is easily stressed unevenly to cause the stability of the result to be deteriorated, the structure realizes the effect that the contact surface on the antiscour adjustable valve sleeve 10 is replaceable, ensures that the upper surface of the antiscour adjustable valve sleeve 10 is smooth and complete, and further improves the stability of the installation structures of the antiscour adjustable valve sleeve 10 and the valve seat 5.

As shown in fig. 3, the valve seat locking mechanism 9 further includes an alignment assembly 24, the alignment assembly 24 includes a mounting ring 25, an alignment ring 26, a limiting ring 27 and a support spring 28, the mounting ring 25 is sleeved on the outer periphery of the valve stem 2 and is mounted on the valve stem 2 through a locking screw 29, the alignment ring 26 is screwed on the outer periphery of the mounting ring 25, a limiting flange 30 for limiting the alignment ring 26 is disposed at the bottom of the mounting ring 25, an alignment flange 31 is disposed on the outer periphery of the alignment ring 26, a reinforcing rib 32 is disposed between the upper end surface of the alignment flange 31 and the outer periphery of the alignment ring 26, a plurality of rotating plates 33 are disposed on the upper end of the alignment ring 26 along the circumferential direction, the number of the limiting ring 27 and the number of the support springs 28 are equal to the number of the pre-tightening screws 17, the limiting ring 27 and the support springs 28 are both sleeved on the outer peripheries of the screw portions of the corresponding pre-tightening screws 17, and the lower ends of the support springs 28 abut against the inner end surfaces of the circular grooves 20, the upper end of the supporting spring 28 is abutted against the lower end face of the limit ring 27 and used for pressing the limit ring 27 at the bottom end of the head of the pre-tightening screw 17, the outer periphery of the limit ring 27 is tightly attached to the inner periphery of the circular groove 20, the inner wall of the pre-tightening pressing ring 16 is provided with a guide hole 34 communicated with the circular groove 20, the side part of the limit ring 27 is provided with a limit convex part 35, and the limit convex part 35 extends out of the guide hole 34 and abuts against the upper end of the alignment flange 31. The alignment assembly 24 can ensure that the screwing depths of the plurality of pre-tightening screws 17 are the same, thereby ensuring that the force of the anti-scouring adjustable valve sleeve 10 is uniform, and further improving the stability of the installation structure of the anti-scouring adjustable valve sleeve 10 and the valve seat 5.

As shown in fig. 3, the inner end surface of the circular groove 20 is provided with a first spring groove 36 coaxial with the circular groove 20, the bottom end of the limiting ring 27 is provided with a second spring groove 37, the upper end of the supporting spring 28 is embedded in the first spring groove 36, and the lower end of the supporting spring 28 is embedded in the second spring groove 37. This design can promote the stability of the support spring 28 installation and movement process.

As shown in fig. 4 and 5, a threaded groove 38 is circumferentially disposed at a position close to a lower end of an inner periphery of the valve seat 5, a mounting ring 39 is threadedly connected in the threaded groove 38, an inner diameter of the mounting ring 39 is the same as an inner diameter of the valve seat 5, two sets of disassembly auxiliary assemblies 40 are symmetrically disposed on the mounting ring 39, each disassembly auxiliary assembly 40 includes a rotating shaft 41 and a pull rod 42, a pair of hidden grooves 43 for the pull rod 42 to be inserted into are symmetrically disposed on an inner wall of the mounting ring 39, friction plates 44 for forming damping fit with the pull rod 42 are disposed at bottoms of the hidden grooves 43, the friction plates 44 are made of a fluororubber material, a through hole 45 communicated with the hidden grooves 43 is disposed on the mounting ring 39, the rotating shaft 41 is inserted into the through hole 45, a circular hole 46 for the rotating shaft 41 to pass through is disposed on the pull rod 42, and a flow guide portion 47 having a trapezoidal cross section is disposed on a side portion of the pull rod 42, the inclined surface of the flow guide part 47 is arranged towards the direction of the first flow channel 6, and when the pull rod 42 is embedded in the hiding groove 43, the flow guide part 47 protrudes out of the hiding groove 43. The valve seat 5 is smooth in the circumferential direction, has no supporting point capable of applying torque, is embedded in the annular mounting groove 12 and is difficult to take out, the pull rod 42 is arranged to apply torque conveniently so as to pull out the valve seat 5, in normal use, the pull rod 42 is embedded in the hidden groove 43, the flow guide part 47 protrudes out of the hidden groove 43, and the turbulent flow state of fluid passing through the valve seat 5 can be improved.

As shown in fig. 3, the upper end surface of the valve flap 4 is provided with a threaded hole 48 and a connecting groove 49 which are communicated with each other from top to bottom, the inner end of the valve rod 2 is provided with a connecting protrusion 50, the threaded hole 48 is connected with a valve flap cover 51 in a threaded manner, and the inner end of the valve flap cover 51 abuts against the inner end of the connecting protrusion 50 so that the connecting protrusion 50 is pressed in the connecting groove 49. This design can realize that valve rod 2 and valve clack 4's linkage are connected, and connection structure is simple, stable and firm.

As shown in fig. 6, the stop valve further comprises a self-sealing assembly 52 and a valve rod sealing assembly 74, the self-sealing assembly 52 comprises a sealing ring 53, a backing ring 54, a four-open ring 55, a first pressing plate 56 and a pre-tightening plate 57, an annular groove 58 is formed in the inner wall of the valve neck of the valve body 1 along the circumferential direction, the four-open ring 55 is embedded on the annular groove 58 at the position close to the outer circumference, the valve cap 3 is inserted into the valve neck of the valve body 1, a sealing cavity 59 with a trapezoidal cross section is formed between the valve cap 3 and the valve body 1, the sealing ring 53 and the backing ring 54 are arranged in the sealing cavity 59 from bottom to top, the cross section of the sealing ring 53 corresponds to the cross section of the sealing cavity 59, the first pressing plate 56 and the pre-tightening plate 57 are arranged above the four-open ring 55, the pre-tightening plate 57 is in threaded connection with the outer circumference of the valve cap 3, a plurality of hexagon socket head screws 60 are in threaded connection with the pre-tightening plate 57 along the circumferential direction, the socket head cap screw 60 penetrates through the pre-tightening plate 57 to press the first pressure plate 56 against the upper end face of the four-way ring 55; the valve rod sealing assembly 74 comprises a packing pressing plate 61, a packing pressing sleeve 62 and a packing 63, a sealing groove 64 coaxial with the valve rod 2 is formed in the valve cover 3, the packing 63 is embedded in the sealing groove 64, the packing pressing plate 61 and the packing pressing sleeve 62 are sleeved on the periphery of the valve rod 2 from top to bottom, the packing pressing plate 61 is connected with the pre-tightening plate 57 through a bolt, and the packing pressing sleeve 62 is pressed on the upper end of the packing 63. The design can ensure the sealing performance between the valve cover 3 and the valve body 1 and between the valve cover 3 and the valve rod 2, and avoid the safety accidents caused by the leakage of the medium inside the valve body 1 to the outside from the gaps between the valve cover 3 and the valve body 1 and between the valve cover 3 and the valve rod 2.

As shown in fig. 1, be equipped with screw thread section 65 on the valve rod 2, threaded connection has valve rod nut 66 on the screw thread section 65, valve rod nut 66's last linkage has hand wheel 67, support 68 is installed through the bolt in the valve neck upper end of valve body 1, and the upper end of support 68 is equipped with the box 69 that the cover was established at valve rod nut 66 periphery, the position that valve rod nut 66 is located in box 69 is equipped with annular protrusion 70 along circumference, and the position that is located annular protrusion 70 upper and lower both ends in box 69 is equipped with a bearing 71 respectively, and the inboard upper portion of box 69 still threaded connection has the clamping ring 72 that is used for pressing annular protrusion 70 and two bearings 71 in box 69. The lifting of the valve can be realized by rotating the hand wheel 67, and then the valve clack 4 is driven to move away from or close to the valve seat 5, so that the valve is simple in structure, convenient to assemble and produce, small in operating torque, and easy to open and close by workers.

Claims (10)

1. The main steam high-temperature high-pressure replaceable valve seat stop valve comprises a valve body (1), a valve rod (2), a valve cover (3), a valve clack (4) and a valve seat (5), wherein a first flow channel (6) and a second flow channel (7) which extend inwards are respectively arranged at two ends of the valve body (1), a flow passing cavity (8) which is used for communicating the first flow channel (6) with the second flow channel (7) is arranged inside the valve body (1), the valve cover (3) is arranged at the upper end of the valve body (1), the valve rod (2) penetrates through the valve cover (3) and extends into the flow passing cavity (8), the valve clack (4) is arranged at the inner end of the valve rod (2), and the valve seat (5) is arranged between the first flow channel (6) and the flow passing cavity (8) and is used for forming sealing fit with the valve clack (4); the method is characterized in that: still include disk seat locking mechanism (9), disk seat locking mechanism (9) are including antiscour adjustable valve barrel (10) and push down subassembly (73), the juncture of first runner (6) and overflow chamber (8) is equipped with supporting flange (11), annular mounting groove (12) have been seted up to one side that is close to overflow chamber (8) on supporting flange (11), disk seat (5) are inlayed and are established in annular mounting groove (12), and the bottom of disk seat (5) is equipped with and is used for constituting sealed complex sealed pad (13) with annular mounting groove (12), push down subassembly (73) setting is used for pressing antiscour adjustable valve barrel (10) on disk seat (5) on the inner wall of overflow chamber (8) for disk seat (5) are compressed tightly on annular mounting groove (12), antiscour adjustable valve barrel (10) and valve clack (4) coaxial setting and the inner wall of antiscour adjustable valve barrel (10) closely laminates with the outer wall of valve clack (4), and the side part of the anti-scouring adjustable valve sleeve (10) is also provided with a flow-through port (14).

2. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 1, characterized in that: and a positioning flange (15) is arranged at the upper end of the valve seat (5), the positioning flange (15) extends into the anti-scouring adjustable valve sleeve (10), and the outer wall of the positioning flange (15) is tightly attached to the inner wall of the anti-scouring adjustable valve sleeve (10).

3. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 1, characterized in that: the lower pressing component (73) comprises a pre-tightening pressing ring (16) and pre-tightening screws (17), a thread part (18) is arranged on the inner wall of the overflowing cavity (8), the pre-tightening pressing ring (16) is in threaded connection with the thread part (18), a plurality of screw holes (19) are formed in the pre-tightening pressing ring (16) along the circumferential direction, a circular groove (20) is formed in the position, located at the upper end of each screw hole (19), of the pre-tightening pressing ring (16), the pre-tightening screws (17) are in threaded fit with the corresponding screw holes (19), the screw rod parts of the pre-tightening screws (17) are abutted to the upper end face of the anti-washing adjustable valve sleeve (10), and the screw head parts of the pre-tightening screws (17) are embedded into the corresponding circular grooves (20).

4. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 3, wherein: the upper end of the anti-scouring adjustable valve sleeve (10) is provided with a spiral pipe part (21) along the circumferential direction, the periphery of the spiral pipe part (21) is in threaded connection with a supporting gasket (22), and an elastic gasket (23) is clamped between the supporting gasket (22) and the anti-scouring adjustable valve sleeve (10).

5. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 3, characterized in that: the valve seat locking mechanism (9) further comprises an alignment assembly (24), the alignment assembly (24) comprises a mounting ring (25), an alignment ring (26), a limiting ring (27) and a support spring (28), the mounting ring (25) is sleeved on the periphery of the valve rod (2) and is mounted on the valve rod (2) through a locking screw (29), the alignment ring (26) is in threaded connection with the periphery of the mounting ring (25), a limiting flange (30) for limiting the alignment ring (26) is arranged at the bottom of the mounting ring (25), an alignment flange (31) is arranged on the periphery of the alignment ring (26), a reinforcing rib (32) is arranged between the upper end face of the alignment flange (31) and the periphery of the alignment ring (26), a plurality of rotating plates (33) are arranged at the upper end of the alignment ring (26) along the circumferential direction, and the number of the limiting ring (27) and the support spring (28) is equal to that of the pre-tightening screws (17), the utility model discloses a stop collar, including spacing ring (27), supporting spring (28), stop collar (27) and supporting spring (28) all overlap and establish the screw portion periphery of corresponding pretension screw (17), the lower extreme of supporting spring (28) supports on the interior terminal surface of circular slot (20), and the upper end of supporting spring (28) supports and is used for pressing stop collar (27) in the screw head bottom of pretension screw (17) on the lower terminal surface of stop collar (27), the periphery of stop collar (27) with the interior week of circular slot (20) is closely laminated, seted up on the inner wall of pretension clamping ring (16) with guide hole (34) that circular slot (20) are linked together, the lateral part of stop collar (27) is equipped with spacing convex part (35), spacing convex part (35) stretch out guide hole (34) and support and are in the upper end of aiming at flange (31).

6. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 5, characterized in that: the inner end face of the circular groove (20) is provided with a first spring groove (36) which is coaxial with the circular groove (20), the bottom end of the limiting ring (27) is provided with a second spring groove (37), the upper end of the supporting spring (28) is embedded in the first spring groove (36), and the lower end of the supporting spring (28) is embedded in the second spring groove (37).

7. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 1, characterized in that: the inner periphery of the valve seat (5) is provided with a thread groove (38) close to the lower end along the circumferential direction, a mounting ring (39) is connected to the thread groove (38) in a threaded manner, the inner diameter of the mounting ring (39) is the same as that of the valve seat (5), two groups of dismounting auxiliary assemblies (40) are symmetrically arranged on the mounting ring (39), each dismounting auxiliary assembly (40) comprises a rotating shaft (41) and a pull rod (42), a pair of hidden grooves (43) for the pull rods (42) to be embedded are symmetrically formed in the inner wall of the mounting ring (39), friction plates (44) which are in damping fit with the pull rods (42) are arranged at the bottoms of the hidden grooves (43), through holes (45) communicated with the hidden grooves (43) are formed in the mounting ring (39), the rotating shaft (41) is inserted into the through holes (45), and round holes (46) for the rotating shaft (41) to pass through are formed in the pull rods (42), the lateral part of pull rod (42) is equipped with water conservancy diversion portion (47) that the cross-section is trapezoidal shape, the inclined plane of water conservancy diversion portion (47) sets up towards first flow channel (6) direction, when pull rod (42) inlays to be established in hiding groove (43), water conservancy diversion portion (47) protrusion is in hiding groove (43).

8. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 1, characterized in that: threaded hole (48) and spread groove (49) that communicate each other are seted up from top to bottom to valve clack (4) up end, the inner of valve rod (2) is equipped with connects convex part (50), threaded connection has valve clack lid (51) on threaded hole (48), the inner of valve clack lid (51) supports connect convex part (50) inner messenger and connect convex part (50) to be compressed tightly in spread groove (49).

9. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 1, characterized in that: the valve body (1) is provided with an annular groove (58) along the circumferential direction on the inner wall of a valve neck, the four-open ring (55) is embedded on the annular groove (58) near the periphery, the valve cover (3) is inserted into the valve neck of the valve body (1), a sealing cavity (59) with a trapezoidal section is formed between the valve cover (3) and the valve body (1), the sealing ring (53) and the backing ring (54) are arranged in the sealing cavity (59) from bottom to top, the sectional shape of the sealing ring (53) corresponds to that of the sealing cavity (59), and the first pressing plate (56) and the pre-tightening plate (57) are arranged above the four-open ring (55), the pre-tightening plate (57) is in threaded connection with the periphery of the valve cover (3), a plurality of inner hexagonal screws (60) are in threaded connection with the pre-tightening plate (57) along the circumferential direction, and the inner hexagonal screws (60) penetrate through the pre-tightening plate (57) to press the first pressing plate (56) on the upper end face of the four-open ring (55); valve rod seal assembly (74) is including pressure plate (61), packing pressure cover (62) and seal packing (63), be equipped with seal groove (64) coaxial in valve rod (2) on valve gap (3), seal packing (63) inlay and establish in seal groove (64), pressure plate (61) and packing press cover (62) to overlap from top to bottom and establish valve rod (2) periphery, and pressure plate (61) of packing is connected with pretension board (57) through the bolt for packing is pressed cover (62) and is pressed in seal packing (63) upper end.

10. The main steam high-temperature high-pressure replaceable valve seat stop valve according to claim 1, characterized in that: be equipped with screw thread section (65) on valve rod (2), threaded connection has valve-stem nut (66) on screw thread section (65), the last linkage of valve-stem nut (66) is connected with hand wheel (67), support (68) are installed through the bolt to the valve neck upper end of valve body (1), and the upper end of support (68) is equipped with box (69) that the cover was established at valve-stem nut (66) periphery, valve-stem nut (66) are located the position of box (69) and are equipped with annular bulge (70) along circumference, and the position that is located annular bulge (70) upper and lower both ends in box (69) is equipped with a bearing (71) respectively, and box (69) inboard upper portion still threaded connection has clamping ring (72) that are used for pressing annular bulge (70) and two bearings (71) in box (69).

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